Combined excess and back pressure check for gas-meters



No. 6I3,68|. Patented Nov. 8, I898. W. B. HOYT.

COMBINED EXCESS AND BACK PRESSURE-CHECK FOB GAS METERS.

(Applieationflled Aug. 21, 1897.)

(N0 Mbdol.)

iiitivilii'vi INVENTOR Mrflfiyfi ATTORNEY m: NORRIS PETERS c0,FNOTO-LITHOU wunmo'rom a. c.

I NITED STATES PATENT OFFICE.

WALTER B. IIOYT, OFELMHURST, NEW YORK.

COMBINED EXCESS AND BACK PRESSURE CHECK FOR GAS-METERS.

slaiaemeimn forming part of Letters Patent No. 613,681,-dated November8, 1898. imitation eta August 21, 1897. Serial no. 649,090. (No model.)

T0 at whom it may concern.-

I Be it known that LWALTER B. HOYT, a citi- Zen of the United States,residing at Elmhurst, Queens county, New York, have invented certain newand useful Improvements in a Oombined Excess an Back Pressure Check forGas-Meters, of'v ich the following is a full, clear, and exactdescription.

My invention relates to checks for gas-meters, and has for its objectsthe prevention of inaccurate registering by gas-meters by reason of whatis commonly termed back pressure, and also the prevention of too-rapidregistering by said meter, resulting from excess pressure.

My invention is illustrated by the accompanying drawings, in which-Figure 1 is a longitudinal section through the center of a gas-pipe andthrough my improved checking apparatus contained therein. Figs. 2, 3,and 4. are perspective views of detai%s, and Fig. 5 is a plan view ofanother detai A A are ends of a gas-pipe connected by means of thewell-known union B and leading from a suitable gas-meter. (Not shown.) Dis the casing of my improved gas-check, the said casing being ofsuitable size and shape to be inserted within the pipe. E is a flange atthe upper edge of said casing D, the same being of slightly-greaterdiameter than the inner diameter of said gas-pipe, so that, as shown inFig. l, the said flange will overlap the end of the pipe. I

F is a gauze disk made from any suitable material. The disk F inoperation is located, preferably, at or near the upper end of the casingD.

G is a washer of a size to correspond substantially to the flange E. TheWasher G provides one means by which the gauze F may be held, the samebeing in this case placed between the said flange and washer.

H is an eyelet of suitable shape and size and located in the disk F.This eyelet loosely surrounds and acts as a guide for the stem I of thevalve J. The valveJ is by preference substantially conical in shape,orit may be of any other shape so long as it is adapted to overlap thevalve-seat K, which is internally directed and made to correspondsubstantially thereto.

The valve-seat K is located in the casing D, preferably at its lowerend. Through the seat K suitable perforations-,one or more,are made.Through these perforations the gas maypass in one direction, the reversedirection of the gas being prevented by the closing of the Valve, ashereinafterdescribed. In the chan* nel around the valve-seat K may beheld a suitable liquid L, such as glycerin, the object of the same beingto perfect the gas-tight joint when the valve shall be closed. In Fig. 1the valve is shown at a point approximately half-way between the openedand the closed position. When the sealing liquid is used, the pressureof gas from below in the pipe A seeking to pass through the pipes in thedirection of the arrow, Fig. 1, raises the valve J, so that its loweredge clears the liquid, leaving sufficient space for the gas to flow.

In placing the device in a gas system the check is dropped into a pipeA. Then by bringing the pipe A into alinement with the pipe A the sameare drawn toward each other by means of the'union B, the adjacent endsof the said pipe engaging and holding the flange E, gauze F, and washerG,

Should it be found that the wire-gauze is too fine, a coarser disk maybe substituted, or vice versa, as required, disks of varying meshesbeing readily obtainable.

While the disk F is designed and is chiefly effective in retarding theexcess flow of gas, it in a way serves to check back pressure. The moreimportant means for accomplishing the latter end is the valve J, whichcloses as soon as the pressure in the pipe A is greater than that inpipe A. The cooperative effect of the gauze F and valve J, however, hasbeen found to be far more effective than the separate use of either.

It should be understood that the valve J may be used without the liquid,and I therefore desire to have-it understood that I claim my inventionwith that end in view.

What I claim is In a combined excess and back pressure check incombination a casing adapted to be held within a pipe and having aflange, an inwardly projecting conical valve seat, a

valve adapted to fit over said seat and having a spindle projectinglongitudinally of said pipe, wire-gauze held by said casing fhrough Yorkand State of New York, this 10th deify which said spindle passes and bywhich it is of August, 1897.

mided said valve operatin to allow the pasr 1 .7 n i age ofgas throughsaid seat and to prevent VVALIER HOX 5 the backward passage through saidseat, sub- XVitnesses:

stantially as described. R. O. MITCHELL,

Signed at New York, in the county of New R. S. OSWALD.

